Question I cannot hear, or I am not heard by the interlocutor


Howdy! I have a Mi 10 5G and in some conversations I'm either not heard, or I can't hear the interlocutor. I don't think it's a problem with the phone, because this one is new and I had the same problem with the previous two, which I returned for the same reason. Could it be a problem with some application, or could it be a problem related to the SIM card? I noticed that if I call the same person I can't hear, I can hear them on Whatsapp without any problem.